Language/Multiple-languages/Culture/Licensed-Free-Databases

The listed are databases, not applications. That is to say, if you don't know programming, maybe they won't help you so much.

Multiple languages

https://unicode.org/ucd/

License address: https://www.unicode.org/copyright.html

Some of its users: Gucharmap, decodeunicode

Unicode.

https://dumps.wikimedia.org/

License address: https://dumps.wikimedia.org/legal.html

Some of its users: Wikimedia

Wikimedia.

https://tatoeba.org/eng/downloads/

License address: https://tatoeba.org/eng/downloads/

Some of its users: ListeningPractice.org, Jisho.org

Parallel corpora. In common words, a sentence in different languages.

https://librivox.org/

License address: https://librivox.org/pages/about-librivox/

Some of its users: ListeningPractice.org

Audio books

http://www.dicto.org.ru/xdxf.html

License address: http://dicto.org.ru/license.html

Some of its users: Dicto

Dictionaries.

http://www.omegawiki.org/Help:Downloading_the_data

License address: http://www.omegawiki.org/Meta:Main_Page

Dictionaries.

http://compling.hss.ntu.edu.sg/omw/

License address: http://compling.hss.ntu.edu.sg/omw/

Dictionaries.

https://en.wiktionary.org/wiki/Wiktionary:Frequency_lists

License address: https://en.wiktionary.org/wiki/Wiktionary:Frequency_lists

Frequency lists.

https://lego.linguistlist.org/

License address: https://lego.linguistlist.org/

Lexicon.

https://panlex.org/source-list/

Lexical database links. Not every link has a license.

Japanese

http://www.edrdg.org/wiki/index.php/Main_Page

License address: https://www.edrdg.org/edrdg/licence.html

Some of its users: Jisho.org, Tagaini Jisho

Japanese dictionaries in multiple languages, Kanji dictionaries in multiple languages, dictionary of radicals, Japanese proper name dictionaries in multiple languages.

https://kanjivg.tagaini.net/

License address: http://kanjivg.tagaini.net/

Some of its users: Tagaini Jisho, Jisho.org

Kanji strokes.

Chinese

https://resources.publicense.moe.edu.tw/index.html

License address: https://resources.publicense.moe.edu.tw/index.html

Some of its users: 萌典

Dictionaries of ROC Mandarin Chinese written in ROC Mandarin Chinese.

https://cc-cedict.org/editor/editor.php

License address: https://cc-cedict.org/wiki/

Some of its users: MDBG, Pleco

Mandarin-English dictionary.

https://chine.in/mandarin/dictionnaire/CFDICT/

License address: https://chine.in/mandarin/dictionnaire/CFDICT/

Some of its users: Chine Informations, Pleco

Mandarin-French dictionary.

http://www.handedict.de/chinesisch_deutsch.php

License address: http://www.handedict.de/chinesisch_deutsch.php?mode=dl&sid=51394be2b6d9cba75946e929b5477d55

Some of its users: HanDeDict, Pleco

Mandarin-German dictionary.

https://chdict.zydeo.net/en/download

License address: https://chdict.zydeo.net/en/download

Some of its users:CHDICT

Mandarin-Hungarian dictionary.

http://cantonese.org/download.html

License address: http://cantonese.org/download.html

Some of its users: CC-Canto, Pleco

Cantonese-English dictionary.

http://www.taiwanesedictionary.org/

License address: http://www.taiwanesedictionary.org/

Taiwanese-English dictionary.

http://lingua.mtsu.edu/chinese-computing/

License address: http://lingua.mtsu.edu/chinese-computing/copyright.html

Frequency lists.

Vietnamese

http://www.informatik.uni-leipzig.de/~duc/Dict/install.html

License address: http://www.informatik.uni-leipzig.de/~duc/Dict/install.html

Some of its users: TuDienHND

Dictionaries in several languages: English, Vietnamese, French, German, Norwegian.

There is a page of introduction: https://vi.wiktionary.org/wiki/Wiktionary:Ngu%E1%BB%93n_g%E1%BB%91c/FVDP